On Thursday 08 March 2018 13:35:49 Marc Zyngier wrote: > On 08/03/18 13:21, Pali Rohár wrote: > > On Thursday 08 March 2018 13:27:15 Pavel Machek wrote: > >> Hi! > >> > >>> Resent without non-upstream patches. > >>> > >>> This backport patchset fixed the spectre issue, it's original branch: > >>> https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=kpti > >>> A few dependency or fixingpatches are also picked up, if they are necessary > >>> and no functional changes. > >>> > >>> No bug found from kernelci.org and lkft testing. It also could be gotten from: > >>> > >>> git://git.linaro.org/kernel/linux-linaro-stable.git v4.9-spectre-upstream-only > >>> > >>> Comments are appreciated! > >> > >> Not entirely related to this patched, but... I have few older ARM > >> boards here, and Nokia N9000 I really care about. > >> > >> AFAICT Meltdown is arm64 only? > > > > IIRC ARMv7 is not affected by meltdown. > > > >> Spectre affects the older boards, too, right? Was there any work done > >> on that? cpuinfo says "ARMv7" for N900. > > > > I remember that I saw some spectre patches for ARMv7 on LKML. This is that patch series: https://www.spinics.net/lists/arm-kernel/msg632065.html > > In general for ARMv7 it is problematic as mitigation needs to change IBE > > Not quite. IBE is part of ACTLR, which is an implementation defined > register, so generalizing this statement to "ARMv7" is plain wrong. Case > in point: A9, A12/A17 do not need any bit to be set. A8 needs IBE to > allow BPIALL to work, A15 needs it for ICIALLUI to perform a BP > invalidation. Ok, Nokia N900 has Cortex A8. -- Pali Rohár pali.rohar@xxxxxxxxx
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